Physics of gust response mitigation in open-loop pitching manoeuvres
Physics of gust response mitigation in open-loop pitching manoeuvres
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Date
2022-07-01
Authors
Sedky, Girguis
Gementzopoulos, Antonios
Andreu-Angulo, Ignacio
Lagor, Francis D.
Jones, Anya R.
Advisor
Citation
Sedky, G., Gementzopoulos, A., Andreu-Angulo, I., Lagor, F., & Jones, A. (2022). Physics of gust response mitigation in open-loop pitching manoeuvres. Journal of Fluid Mechanics, 944, A38.
Abstract
This paper experimentally investigates the flow field development and unsteady loading
of three force-mitigating pitch manoeuvres during a transverse gust encounter. The
manoeuvres are constructed using varying levels of theoretical and simulation fidelity
and implemented as open-loop kinematics in a water towing tank. It is found that pitch
actuation during a gust encounter results in two important changes in flow topology: (i)
early detachment of the leading-edge vortex (LEV) and (ii) formation of an LEV on the
pressure side of the wing upon gust exit. Each of the pitch manoeuvres is found to mitigate
a significant portion of the circulatory contribution of the lift force while only manoeuvres
with accurate modelling of the added-mass force are found to adequately mitigate the
total lift force. The penalty of aerodynamic lift mitigation using pitch manoeuvres was a
twofold increase in the pitching moment transients experienced by the wing for all cases.
By quantifying changes in the vertical gust momentum before and after the encounter,
lift-mitigating manoeuvres were found to reduce the disturbance to the gust’s flow field,
thereby reducing the momentum exchange between the gust and the wing.